1 – Resonance fluorescence emission from single semiconductor quantum dots coupled to high-quality microcavities

Applying continuous-wave (CW) pure resonant s-shell optical excitation on single semiconductor quantum dots embedded in high-quality micropillar cavities, the generation of highly indistinguishable photons in resonance fluorescence is demonstrated. By controlling the spontaneous emission lifetime of the quantum emitters in weak coupling to the mode, close to Fourier transform-limited photon emission is demonstrated. In this context, also the coherence properties of singlequantum dot resonance fluorescence are investigated with respect to the effect of excitation-induced dephasing. Quantitative consistence is found with predictions of a theoretical model on phonon-dressed Mollow triplet emission in the cavity-QED regime. Furthermore, the prominent effect of non-resonant emitter-cavity coupling is demonstrated and utilized as a promising and powerful spectroscopic ‘monitoring’ tool to access relevant aspects of quantum dot ground state emission characteristics under pure resonant excitation.